The article details a waterproofing project for a tunnel's main structure, where multiple waterproofing measures were applied at the construction joints, including:

*   Externally bonded rubber waterstops

*   Embedded steel-edged rubber waterstops

*   Removable rubber waterstops

*   Hydrophilic waterstop strips

*   Waterproofing membranes, etc.

In other words, this project did not rely on a single waterstop; instead, it employed a multi-barrier waterproofing system to collectively control seepage.